curl: Fix response status parsing (#633)

The response headers can have multiple steps in them, example:

"HTTP/1.1 200 Connection established",
"",
"HTTP/1.1 400 Bad Request",
"Content-Security-Policy: default-src 'none'; sandbox",
"Content-Type: text/plain; charset=utf-8",
"Strict-Transport-Security: max-age=31536000",
"X-Content-Type-Options: nosniff",

before this would be reported as 200 incorrectly instead of 400 bad request.
this fixes that issue

Signed-off-by: Tomas Slusny <slusnucky@gmail.com>

Author: deathbeam

lua/plenary/curl.lua

@@ -251,15 +251,25 @@ end
 ------------------------------------------------------------
 parse.response = function(lines, dump_path, code)
   local headers = P.readlines(dump_path)
-  local status = tonumber(string.match(headers[1], "([%w+]%d+)"))
-  local body = F.join(lines, "\n")
+  local status = nil
+  local processed_headers = {}
+
+  -- Process headers in a single pass
+  for _, line in ipairs(headers) do
+    local status_match = line:match "^HTTP/%S*%s+(%d+)"
+    if status_match then
+      status = tonumber(status_match)
+    elseif line ~= "" then
+      table.insert(processed_headers, line)
+    end
+  end
 
+  local body = F.join(lines, "\n")
   vim.loop.fs_unlink(dump_path)
-  table.remove(headers, 1)
 
   return {
-    status = status,
-    headers = headers,
+    status = status or 0,
+    headers = processed_headers,
     body = body,
     exit = code,
   }